import type { APIRoute } from 'astro';
import { getUserIdFromToken } from './auth';

/* ── In-memory groups store ────────────────────────────────── */
type Group = {
  id: string;
  name: string;
  description: string;
  members: Set<string>;
};

export const groups = new Map<string, Group>();

// Seed groups
groups.set('family', {
  id: 'family',
  name: 'Family',
  description: 'The whole family',
  members: new Set(['junwon', 'sungho', 'mikyung', 'soojin']),
});

groups.set('parents', {
  id: 'parents',
  name: 'Parents',
  description: 'Mom & Dad',
  members: new Set(['sungho', 'mikyung']),
});

groups.set('siblings', {
  id: 'siblings',
  name: 'Siblings',
  description: 'Junwon & Soojin',
  members: new Set(['junwon', 'soojin']),
});

/* ── GET /family/api/groups?token=TOKEN ────────────────────── */
export const GET: APIRoute = async ({ url }) => {
  const token = url.searchParams.get('token');
  const userId = getUserIdFromToken(token);
  if (!userId) {
    return new Response(JSON.stringify({ error: 'Unauthorized' }), {
      status: 401,
      headers: { 'Content-Type': 'application/json' },
    });
  }

  const result = Array.from(groups.values()).map((g) => ({
    id: g.id,
    name: g.name,
    description: g.description,
    member_count: g.members.size,
    is_member: g.members.has(userId),
  }));

  return new Response(JSON.stringify(result), {
    status: 200,
    headers: { 'Content-Type': 'application/json' },
  });
};

/* ── POST /family/api/groups — join a group ────────────────── */
export const POST: APIRoute = async ({ request }) => {
  const body = await request.json();
  const { token, groupId } = body;

  const userId = getUserIdFromToken(token);
  if (!userId) {
    return new Response(JSON.stringify({ error: 'Unauthorized' }), {
      status: 401,
      headers: { 'Content-Type': 'application/json' },
    });
  }

  const group = groups.get(groupId);
  if (!group) {
    return new Response(JSON.stringify({ error: 'Group not found' }), {
      status: 404,
      headers: { 'Content-Type': 'application/json' },
    });
  }

  group.members.add(userId);
  return new Response(JSON.stringify({ ok: true }), {
    status: 200,
    headers: { 'Content-Type': 'application/json' },
  });
};